Fabric Mods for Minecraft 1.21
Browse 24,909 free Fabric mods for Minecraft 1.21 — popular picks include Spiky Spikes, XK's Decoration, DarkMobs - RPG Mob Difficulty (Dark Souls Like Mobs).
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Spiky Spikes
Don't step on it! Hurts almost as much as stepping on LEGO... ouch
XK's Decoration
a multi-purpose decoration mod that adds more than 600 blocks, featuring a variety of themes ranging from many ancient civilizations to sci-fi punk or factories.
DarkMobs - RPG Mob Difficulty (Dark Souls Like Mobs)
RPG Increase difficulty of mobs making them harder to kill and making it a challenge
Furnish
Fancy furniture for Minecraft!
Cobbleloots: Loot Balls and More!
A side-mod for cobblemon that adds different ways to obtain items like in the original games.
Blue Archive Halo
Render halos for beacons. client only.
DarkRPG Menu - DarkMenu (RPG Theme)
Main Menu From DarkRPG Pack
Nature's Delight
A mod to bridge Farmer's Delight and Nature's Spirit
Styled Chat
Change style of your server's chat! (Fabric)
Mob Drops Recipes [Nether]
Now you can craft drops from hostile mobs in the Nether!
Cobblemon Move Inspector
Clientside in-battle move inspection for Cobblemon
Zombie Horse Spawn
🧟♂🐴 Allows zombie horses to spawn with a zombie riding it and other tweaks.
Trample No More
This mod adds a few nice tweaks to Minecraft's farmland trampling.
MCDoom
Adds content from Doom to Minecraft.
Cosmetica
Free custom capes and cosmetics for Minecraft

Ender Dragon Fight Remastered
A difficulty increase of Minecraft's final boss, with a focus on a somewhat Vanilla feel.
Simple Conveyor Belts
A basic conveyor belt mod. Adds spline-based item belts, that transport items from point A to B. Allows for item logistics in any shape and form.
DnT Ocean Monument Overhaul
This Mod/Datapack Overhauls the Ocean Monument, turning it into a jigsaw structure, every room has randomized walls and floors, and some loot chests are scattered around
StateObserver
A library for observing state changes.
Mob Drops Recipes [End]
Now you can craft drops from hostile mobs in the End!
Flourish
Use bonemeal to spread small flowers. Previously known as Flora Doubling.
Armor Stand Arms (RPG Theme)
RPG Style, Use a command to easily show arms on your armor stands
Better Safe Bed
This mod solves the issue of being unable to sleep even when you are safe, due to a random mob lurking in the cave beneath your base.
Advanced XRay (Fabric Edition)
A simple but advanced XRay mod that allows you to find all of your most loved blocks. Now for Fabric as well!
Heartstone
Heartstones are items which come in sets, and allows for people to find eachother when in the inventory.
Elemental Wizards (RPG Series Plus)
Master the elements to overcome your foes! Spell Engine Add-On
Better Tag NBT Tips
Display NBT and Tags in tooltips, and more...
Fetzi's Asian Decoration
This mod adds asian (Japanese, Chinese, etc.) styled roof blocks, pagodas, lanterns and much more!
Wabi-Sabi Structures (Fabric)
A collection of unique, quality structures based on the Japanese concept of "Wabi-Sabi"

Antique Atlas 4
A hand-drawn clientside world map, with map sharing, structure discovery, and less! A map frontend for Surveyor based on hunternif's Antique Atlas.
Grass Seeds
🌱 Allows players to use normal seeds to transform dirt into (tall) grass.
Cobblemon Unchained
Naturally spawning Hidden Abilities. KOs and/or captures increase nearby shiny rates, and can also give perfect IVs to nearby spawns.
Ears (+ Snouts/Muzzles, Tails, Horns, Wings, and More)
More skin customization options for just about every version + skin backports for pre-1.9 versions. Skinport port patch texture fix
Distant Friends
Player like mobs that look at you from a distance
What's That Slot?
Utility that highlights which items can be placed in an item slot.

ViaVersion
Allow newer Java Edition clients to connect to older servers.